-But if the rendering fails for one reason or another, (or is perhaps
-inadequate if you really need to see the graphical presentation of the
-HTML message), it can be useful to display the message in an external
-viewer, such as a web browser. Here's a little script that Keith
-Packard wrote, which he calls `view-html`:
+But if the rendering fails for one reason or another, or if you really
+need to see the graphical presentation of the HTML message, it can be
+useful to display the message in an external viewer, such as a web
+browser. Here's a little script that Keith Packard wrote, which he
+calls `view-html`: